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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Securities, held-to-maturity, Amortized Cost $ 74,413          
Securities held-to-maturity, Fair Value 64,337   $ 62,550      
Securities held-to-maturity, Gross Unrecognized Losses 10,076   12,261      
Securities held-to-maturity, Allowance for credit losses (1,079) $ (1,087) (1,100) $ (1,085) $ (986) $ (862)
Securities held-to-maturity 73,334   73,711      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 967,095          
Securities, available-for-sale, Unallocated portfolio layer basis adjustments (5,504)          
Securities available-for-sale 961,591   826,881      
Securities, available-for-sale, Fair Value 869,556   735,357      
Securities available for sale, Gross Unrealized Gains 210   5      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 97,749          
Securities available for sale, Gross Unrealized Losses 92,245   91,529      
Other Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 1,434          
Securities available-for-sale     1,516      
Securities, available-for-sale, Fair Value 1,434   1,516      
Securities available for sale, Gross Unrealized Gains 0   0      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 0          
Securities available for sale, Gross Unrealized Losses     0      
US Government Agencies Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 83,339          
Securities available-for-sale     83,720      
Securities, available-for-sale, Fair Value 81,290   81,103      
Securities available for sale, Gross Unrealized Gains 151   2      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 2,200          
Securities available for sale, Gross Unrealized Losses     2,619      
Corporate Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 173,095          
Securities available-for-sale     146,430      
Securities, available-for-sale, Fair Value 150,602   131,766      
Securities available for sale, Gross Unrealized Gains 0   0      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 22,493          
Securities available for sale, Gross Unrealized Losses     14,664      
US States and Political Subdivisions Debt Securities [Member]            
Securities, held-to-maturity, Amortized Cost 66,548   66,936      
Securities held-to-maturity, Fair Value 57,326   55,561      
Securities held-to-maturity, Gross Unrecognized Losses 9,222   11,375      
Mutual Fund Debt Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 11,346          
Securities available-for-sale     11,211      
Securities, available-for-sale, Fair Value 11,346   11,211      
Securities available for sale, Gross Unrealized Gains 0   0      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 0          
Securities available for sale, Gross Unrealized Losses     0      
Collateralized Debt Obligations [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 262,471          
Securities available-for-sale     129,684      
Securities, available-for-sale, Fair Value 258,973   125,478      
Securities available for sale, Gross Unrealized Gains 58   0      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 3,556          
Securities available for sale, Gross Unrealized Losses     4,206      
Other Debt Obligations            
Securities, held-to-maturity, Amortized Cost 66,548   66,936      
Securities held-to-maturity, Fair Value 57,326   55,561      
Securities held-to-maturity, Gross Unrecognized Losses 9,222   11,375      
Collateralized Mortgage Backed Securities            
Securities, held-to-maturity, Amortized Cost 7,865   7,875      
Securities held-to-maturity, Fair Value 7,011   6,989      
Securities held-to-maturity, Gross Unrecognized Losses 854   886      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 435,410          
Securities available-for-sale     454,320      
Securities, available-for-sale, Fair Value 365,911   384,283      
Securities available for sale, Gross Unrealized Gains 1   3      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 69,500          
Securities available for sale, Gross Unrealized Losses     70,040      
REMIC and CMO [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 168,675          
Securities available-for-sale     175,712      
Securities, available-for-sale, Fair Value 140,161   148,414      
Securities available for sale, Gross Unrealized Gains 0   0      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 28,514          
Securities available for sale, Gross Unrealized Losses     27,298      
GNMA [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 8,861          
Securities available-for-sale     9,193      
Securities, available-for-sale, Fair Value 7,079   7,317      
Securities available for sale, Gross Unrealized Gains 1   3      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 1,783          
Securities available for sale, Gross Unrealized Losses     1,879      
FNMA [Member]            
Securities, held-to-maturity, Amortized Cost 7,865   7,875      
Securities held-to-maturity, Fair Value 7,011   6,989      
Securities held-to-maturity, Gross Unrecognized Losses 854   886      
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 165,064          
Securities available-for-sale     172,690      
Securities, available-for-sale, Fair Value 141,717   148,265      
Securities available for sale, Gross Unrealized Gains 0   0      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 23,347          
Securities available for sale, Gross Unrealized Losses     24,425      
FHLMC [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 92,810          
Securities available-for-sale     96,725      
Securities, available-for-sale, Fair Value 76,954   80,287      
Securities available for sale, Gross Unrealized Gains 0   0      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments 15,856          
Securities available for sale, Gross Unrealized Losses     16,438      
Available for Sale Securities Excluding Mortgage Backed Securities [Member]            
Securities available-for-sale, Amortized Cost excluding portfolio layer adjustments 531,685          
Securities available-for-sale     372,561      
Securities, available-for-sale, Fair Value 503,645   351,074      
Securities available for sale, Gross Unrealized Gains 209   2      
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments $ 28,249          
Securities available for sale, Gross Unrealized Losses     $ 21,489